fix(bedrock): improve AWS credential handling and add model definitions

- Change error to warning when AWS credentials are missing in environment
- Allow fallback to system configuration (aws config files or instance profiles)
- Remove hardcoded region and profile parameters in Bedrock client
- Add Claude 3.7 Sonnet and DeepSeek R1 model definitions for Bedrock
- Update config manager to properly handle Bedrock provider

scripts/modules/supported-models.json

@@ -1,4 +1,20 @@
 {
+	"bedrock": [
+		{
+			"id": "us.anthropic.claude-3-7-sonnet-20250219-v1:0",
+			"swe_score": 0.623,
+			"cost_per_1m_tokens": { "input": 3, "output": 15 },
+			"allowed_roles": [ "main", "fallback" ],
+			"max_tokens": 65536
+		},
+		{
+			"id": "us.deepseek.r1-v1:0",
+			"swe_score": 0,
+			"cost_per_1m_tokens": { "input": 1.35, "output": 5.4 },
+			"allowed_roles": [ "research" ],
+			"max_tokens": 65536
+		}
+	],
 	"anthropic": [
 		{
 			"id": "claude-sonnet-4-20250514",